JPH0968123A - Fuel temperature raising device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce viscosity by providing a heater for raising the temperature of A heavy oil, in a fuel temperature rising device to feed fuel to a gas turbine combustor. SOLUTION: A heavy oil 11 stored in a fuel tank 1 flows through a fuel injection pump 2 and a fuel cut-off valve 3 and is guided to a combustion through a piping 12. A part of the A heavy oil is heated by a double pipe type heater 7 (A) through a bypass pipe 4, located in the middle of a fuel feed system 13, a pressure regulation valve 5, and a check valve 6. Further, the A heavy oil is heated by heaters 7 (B) and (C) after the flow of it through a sluice valve 10 and a bypass pipe 9 and returned to a fuel tank 17 through a piping 14 to rise temperature. Since, through control of slice valves 8 and 10, the increase of the temperature of the A heavy oil is controlled only by the heater (A) or through the flow of it through three spots of the heaters 7 (A), (B), and (C), the temperature of the A heavy oil is rised to a proper temperature and viscosity is reduced for injection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel temperature raising device installed in a system for supplying fuel to a gas turbine combustor.

[0002]

2. Description of the Related Art Combustion of various fuels in a gas turbine combustor requires high combustion efficiency over a wide range of mixing ratios, stable combustion, and vibration combustion and blowout. In order to improve the atomization of the fuel, such as the lack of pressure loss, the absence of deposits such as carbon and ash, the uniform outlet temperature distribution, and the ease of re-ignition. More important than anything

Therefore, although not shown, the fuel supply system is provided with a fuel tank, a filter, a fuel injection pump, a fuel cutoff valve, a fuel injection nozzle, various control valves, a safety device and the like.

However, in such a conventional fuel supply system, no equipment for heating the fuel is installed even when heavy fuel oil A is used as the fuel. Compared with B heavy oil and the like, A heavy oil has a higher viscosity at the same temperature, and may cause problems such as clogging of the filter and fuel piping system and poor ignition.

[0005]

A conventional gas turbine,
In a fuel supply system such as, when using heavy A fuel oil with high viscosity as a fuel, since there is no heating device for A fuel oil,
When the pressure difference between the fuel injection nozzle pressure and the air pressure is small, the viscosity is high, so the atomization of heavy oil A is poor and it is difficult to ignite. Also, even if it ignites, the oil particles are large and irregular combustion and carbon
It causes various harmful effects such as easy accumulation of ash.

In order to solve such a problem, the present invention provides a bypass pipe branched from a pipe system from a fuel tank to a fuel injection pump, a fuel cutoff valve and a combustor.
It is an object of the present invention to provide a fuel temperature raising device for providing a heater for heating fuel to the bypass pipe to raise the temperature of the fuel and reduce its viscosity.

[0007]

Therefore, according to the present invention,
(1) A bypass pipe is provided which branches from a discharge pipe of an injection pump of a fuel supply system for boosting heavy fuel oil from a fuel tank by a fuel injection pump to guide it to a combustion chamber and returning to the fuel tank.
There is provided a fuel temperature raising device characterized in that a heavy oil heater is provided in the bypass pipe via a sluice valve.

(2) Further, in the above-mentioned (1), the bypass pipe is composed of first and second bypass pipes, and the first bypass pipe has a pressure control valve, a check valve, and a check valve in order from the upstream side.
A heavy oil heater and a first sluice valve are installed and returned to the fuel tank, and a second bypass pipe bypasses the first sluice valve and is connected to a first bypass pipe leading to the fuel tank. There is provided a fuel temperature raising device characterized by comprising two sluice valves and a plurality of heavy oil heaters.

(3) Further, in the above (1) or (2), the heavy oil heater has a main body, a heavy oil passage pipe penetrating through the main body, and a steam inlet for allowing heated steam to flow in and out of the main body. There is provided a fuel temperature raising device having a double pipe structure composed of an outlet nozzle and an outlet nozzle.

The present invention has the above-described structure. In the invention of (1), the heavy oil fuel whose pressure is increased by the fuel injection pump from the fuel tank is partially bypassed from the discharge pipe of the injection pump through the bypass pipe, For example, 5 kgf / cm ²
The heavy oil whose pressure is adjusted to G is heated by the heavy oil heater installed in the bypass pipe, the oil temperature rises, returns to the fuel tank, and the viscosity of the heavy fuel in the fuel tank is atomized well by the fuel injection nozzle. Is reduced to the viscosity at which Therefore, for example, even in the case of a high-viscosity oil such as heavy oil A, the heavy fuel oil has increased fluidity and can be pressurized and injected by the fuel injection pump, resulting in good atomization and no ignition failure.

In the invention of (2), a part of the heavy fuel oil from the fuel tank passes from the discharge pipe of the injection pump through the first bypass pipe to bypass the pressure control valve, for example, 5
The pressure is regulated to kgf / cm ² G and is heated in the first heavy oil heater through the check valve. Furthermore, the first sluice valve is closed,
When the second sluice valve is opened, it passes through the second bypass pipe,
It is heated by multiple heavy oil heaters and rises in temperature, returns to the fuel tank, and sufficiently reduces the viscosity of the heavy oil fuel in the fuel tank.
Similar to the above, good atomization is performed by the injection nozzle, and ignition failure and the like are prevented. The first sluice valve is opened and the second
When the sluice valve is closed, the heavy fuel is heated only by the first heater provided in the first bypass pipe and returns to the fuel tank.

As described above, since the oil temperature can be adjusted by operating the first and second sluice valves arranged in the first and second bypass pipes, it is possible to cope with changes in steam conditions and changes in temperature. You can respond freely.

In the invention of (3), in (1) or (2), the heavy oil heater has a double pipe structure, and the heavy oil fuel to be heated flows in the passage pipe penetrating the inside of the main body, and from the steam inlet nozzle. Since the steam extracted from the boiler or the steam turbine system flows in, flows out from the steam outlet nozzle, passes through the inside of the main body, and heats the passage pipe, it is possible to easily heat the heavy oil by using the steam as a heat source.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a system diagram of a fuel temperature raising device according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a fuel tank in which heavy oil A 11 is stored. 2 is a fuel injection pump, 3 is a fuel cutoff valve, 4 is a bypass pipe of the fuel supply system 13, 5 is a pressure control valve, 6 is a check valve, and 7 is a double pipe type installed in the system of this bypass pipe 4. It is a heater (A).

Reference numeral 8 is a sluice valve, and a bypass pipe 9 is connected to a front position of the sluice valve 8 through another sluice valve 10, and (B) of two double pipe type heaters 7, (C) is connected to join the bypass pipe 4 from the pipe 14 and return to the fuel tank 1.

FIG. 2 is a side view of the double-tube heater 7 shown in FIG. 1, in which a passage pipe 22 for heavy oil A is passed through the main body 21 of the heater 7. A steam inlet nozzle 23 and a steam outlet nozzle 24 are arranged in the main body 21.

The steam inlet nozzle 23 is supplied with steam extracted from a boiler or a steam turbine system in the case of a combined cycle, for example. Steam outlet nozzle 2
A steam drain trap 26 is installed in the pipe 25 connected to the nozzle 4, and the steam that has become the drain is discharged.

In the fuel temperature raising device having such a structure,
The heavy fuel oil A stored in the fuel tank 1 is pressurized by the fuel injection pump 2, passes through the fuel cutoff valve 3, and is sent by a pipe 12 to a combustor (not shown).

Further, as described above, the fuel supply system 13 is provided with the bypass pipe 4 before reaching the fuel cutoff valve 3.
A pressure control valve 5 (5 kgf / cm ² is provided in the flow path of the bypass pipe 4.
A pressure control valve (G), a check valve 6 and a double-tube heater 7 using steam are installed, and steam is supplied from a boiler or turbine system from a steam inlet nozzle 23.

Heavy fuel oil A is bypassed by the bypass pipe 4, passes through the passage pipe 22 as shown in FIG. 2, is heated by the steam in the main body 21 during this period, and then flows to the sluice valve 8.
Another bypass pipe 9 is provided in front of the sluice valve 8, and the sluice valve 10 and the double pipe heaters 7 (B) and (C) are provided.
2 units are installed, the heavy fuel oil A is heated by the heater 7 (A) by controlling the opening / closing of the sluice valves 8 and 10, and further heated by the heaters 7 (B), (C). And piping 1
4, the first bypass pipe 4 is connected to reach the fuel tank 1, and the above circulation is repeated again to raise the temperature of the entire fuel oil.

Further, the sluice valve 10 of the other bypass pipe 9 is closed and the sluice valve 8 is opened by the degree of temperature rise of the A heavy oil, and the A heavy oil is heated only by the heater 7 (A), and the heater ( The fuel oil temperature can be adjusted by returning the fuel oil to the fuel tank 1 without going through B) and (C).

Control of these valves 5, 8 and 9 is performed by a control panel (not shown) or manually. For example, the temperature of fuel oil in the fuel tank 1 is detected, and when the temperature becomes higher than a predetermined temperature, control is performed. A drive signal is sent from the device, the sluice valve 10 is closed, the sluice valve 8 is opened without passing the flow of the heavy oil A through the bypass pipe 9, and only the heater 7 (A) is heated to fuel tank 1
If the temperature falls below the predetermined value, the gate valve 10 is opened and the gate valve 8 is closed to set A
The heavy oil is caused to flow into the bypass pipe 9 so that the heater 7 (A),
By (B) and (C), heating can be automatically controlled to return to the fuel tank 1.

In summary, the embodiment of the present invention is as follows.
A heavy fuel oil bypass pipe 4 is branched from a pipe 13 from the discharge pipe of the heavy fuel oil injection pump 2 of the fuel supply system to the shutoff valve 3.
And a pressure control valve 5, a check valve 6, a double pipe heater 7 (A) and a sluice valve 8 are installed in this order from the upstream side of the bypass pipe 4, and the sluice is returned to the fuel tank 1 and further A pipe 9 for bypassing the valve 8 is provided, and a sluice valve 10 and two double pipe heaters 7 (B) and (C) are installed in the pipe line 9, and a bypass pipe 4 leading to the fuel tank 1 is provided. Connected to the road.

With such a configuration, the heavy oil A is heated to an appropriate temperature, the oil temperature rises, the viscosity is reduced to a viscosity at which the fuel injection nozzle 2 performs good atomization, the fluidity is increased, and the fuel is injected. To be done.

Further, the sluice valve 8 disposed in the bypass line,
Since the oil temperature can be adjusted by the operation of 10, it is possible to respond freely to changes in steam conditions and changes in temperature.

[0026]

As described above in detail, according to the present invention, the bypass pipe is branched from the fuel injection pump discharge pipe of the fuel supply system and returned to the fuel tank, and the heavy oil is supplied to the bypass pipe through the sluice valve. A fuel temperature increasing device for heating heavy oil fuel is provided with a heater. Further, the bypass pipes are first and second bypass pipes, and the first bypass pipe has a pressure control valve, a check valve, and heavy oil heating. And a first sluice valve are provided, and a second bypass valve is provided with a second sluice valve and a plurality of heavy oil heaters. A fuel temperature raising device is also provided. Further, the heavy oil heater is composed of a main body and a passage pipe. Since the structure of heating with steam as a double pipe structure is also provided, the following effects are achieved.

(1) By heating the heavy fuel oil A, the oil temperature rises, the viscosity decreases, and the fluidity improves. Therefore, atomization at the time of injection from the fuel injection nozzle is good, and nonconformity events such as no ignition do not occur.

(2) Further, since the heating temperature can be controlled by controlling the opening and closing of the sluice valve, it is possible to freely cope with changes in heating steam conditions and changes in temperature.

(3) Since the heavy oil heater has a double tube structure, steam can be used as a heating source, and therefore steam can be extracted from the boiler or turbine steam system to easily heat the heavy oil fuel.

[Brief description of drawings]

FIG. 1 is a system diagram of a fuel temperature raising device according to an embodiment of the present invention.

FIG. 2 is a side view of a double-tube heater in the fuel temperature raising device shown in FIG. 1 of the present invention.

[Explanation of Codes] 1 Fuel tank 2 Fuel injection pump 3 Fuel cutoff valve 4,9 Bypass pipe 5 Pressure control valve 6 Check valve 7 Double pipe heater 8, 10 Gate valve 11 A heavy oil 13 Fuel supply system 21 Heating Main unit 22 Passage pipe 23 Steam inlet nozzle 24 Steam outlet nozzle

Claims (3)

[Claims] 1. A bypass pipe is provided which branches from a discharge pipe of an injection pump of a fuel supply system for boosting heavy fuel oil from a fuel tank with a fuel injection pump to guide it to a combustion chamber and returning to the fuel tank. The fuel temperature raising device is characterized in that a heavy oil heater is provided in the valve via a sluice valve. 2. The bypass pipe comprises first and second bypass pipes, and a pressure control valve, a check valve, a heavy oil heater and a first sluice valve are installed on the first bypass pipe in order from the upstream side. And returns to the fuel tank, and the second bypass pipe bypasses the first sluice valve to reach the fuel tank.
2. The fuel temperature raising device according to claim 1, further comprising a second sluice valve and a plurality of heavy oil heaters connected to the bypass pipe. 3. The heavy oil heater has a double pipe structure including a main body, a heavy oil passage pipe penetrating through the main body, and a steam inlet and outlet nozzles through which heated steam flows in and out of the main body. The fuel temperature raising device according to claim 1 or 2, which is characterized.